diff --git a/library/src/layout/par.rs b/library/src/layout/par.rs
index 6b914e808..cca38ed38 100644
--- a/library/src/layout/par.rs
+++ b/library/src/layout/par.rs
@@ -514,12 +514,18 @@ impl<'a> Line<'a> {
 
     /// How much can the line stretch
     fn stretchability(&self) -> Abs {
-        self.items().filter_map(Item::text).map(|s| s.stretchability()).sum()
+        self.items()
+            .filter_map(Item::text)
+            .map(|s| s.stretchability())
+            .fold(Abs::zero(), |acc, x| acc + x)
     }
 
     /// How much can the line shrink
     fn shrinkability(&self) -> Abs {
-        self.items().filter_map(Item::text).map(|s| s.shrinkability()).sum()
+        self.items()
+            .filter_map(Item::text)
+            .map(|s| s.shrinkability())
+            .fold(Abs::zero(), |acc, x| acc + x)
     }
 
     /// The sum of fractions in the line.